Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac94cec8b28af658…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 00:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 05da2546bc3511570c414da6bf31061f SHA-1: d7d6af3f74268ffd6aaf408d362c2ca502c50150 SHA-256: ac94cec8b28af658220a6688e62e533e630bb7e2824bc32ebac61eb1f3ed3c41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dolmalatrek.com/userfiles/file/8283743626.pdf In PDF document text
    • http://obrienbuilders.com/userfiles/file/fezitojo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfdc3517---73946524221.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/jisemese.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/85594676834.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rasimopibaxuxukeniranigip.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/48702289834.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kofolanavujosowu.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/9427354092.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d86b4548---19655517799.pdfIn PDF document text
    • https://theipbuzz.com/images/file/fovuvi.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/82998216388.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/80070414079.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/81462499118.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/13525538038.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/12825885242.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/41974679032.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/zoxibajekuw.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/92856827775.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/50379702774.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/73966117809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=play+subway+surfers+online+free+no+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 10688 bytes
SHA-256: 76586cc03132781dbe0e50eb052af05b00db79d6b82fd6e355b6ccda02155a63
font_02_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 15896 bytes
SHA-256: 2f4942cb267b3c28f72a496e9f0608da0d37df3fbbf21bcfc2f111e2aafed9ea

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